| Acronym | Meaning |
| SC-2D | State-correlated Two-dimensional (NMR Spectroscopy) |
| MCDF-OL | Multiconfiguration Dirac-Fock Optimum Level |
| ERG | Emergency Response Guidebook |
| LEOS | Lasers And Electro-Optics Society |
| TAP | Toxic Air Pollutant |
| FRS | Forward Recoil Spectrometry |
| OVOS | Optimized Virtual Orbital Space Approximation (for Correlated Calcns.) |
| MIDAS | Metal Ion-dependent Adhesion Site |
| ESWTR | Enhanced Surface Water Treatment Rule |
| MAG | Metal Arc Gas (welding) |